Improvement in friction-pawl or clutch mechanisms



UNITED STATES PATENT FFICE.

WALTER RQCLOSE, OF BANGOR, MAINE, ASSIGNOR TO HIMSELF, JOHN E. M.SANFORD, `EMON C. SMART, JOB OOLLETT, REUEL W. KIMBALL,.WILLIAMMARGESSON & SON, AND FREDERICK H. COOMBS, OF SAME PLAGE.

IMPROVEMENT IN FRlCTlON-PAWl. OR CLUTCH MECHANISMS.`

Specification forming part of Letters Patent No. 116,413, dated June 27,1871.

To all-whom it may concern:

Be it known that I, WALTER R. OLosE, of Bangor, in the county ofPenobscot and-State of Maine, have invented an Improved Friction-Pawllor Clutch Mechanism; and I do hereby declare that the following, takenin connection with the drawingwhich accompanies andforms part of thisspecification, is a description of my invention sufcient to enable thoseskilled in the art to practice it.

y My invention relates to an improved construction of a friction feedmechanism, particularly intended for imparting rotative movement to ashaft from a treadle; and the invention may be said to consist of twopulleys placed together on the shaft to be driven, and each loose uponthe shaft, but clutched or held thereto in moving in one direction by apeculiarfriction-pawl or clutch mechanism, which mechanism is boxed upor inclosed between and by inwardlyprojecting pe ripheral flanges of thetwo pulleys. Fixed on the shaft between the pulleys is a clutch-wheel,in the perimeter of which are inclines or pockets in which arefriction-rolls, one set to each pulley,

each roll of either set being kept at the large end or bottom of thepocket as lits pulley rotates in one direction, and being then in suchposition that the wheel and the pulley can have free rel-l ativerotation, while, when either pulley rotates in theopposite direction,each roll within it starts along the incline until it cramps or bindsbetween `ithe pulley-shell and the incline, when the wheel (with theshaft) and the pulley and roll will all rotate together or as one piece.tion-pawl or clutch mechanism, cased in between and'by the pulleys, thatmy invention consists.

rlhe drawing represents a shaft and pulley mechanism embodying theinvention. A shows a diametric section; B, a section on the line a: av,-C, an elevation, with the pulley-lianges or shells broken out to showthe rolls within. v ct denotes the shaft; b c, the two pulleys, looseupon the shaft, and confined (from end play) between a shoulder, d, ofthe shaft and a collar, f, fixed on the shaft. Each pulley is formedwith a hub, g, a web, h, and an outwardly-projecting flange, i; and fromeach web h extendsan inwardly-projecting peripheral ilange, k, the twoflanges k k meeting or nearly meeting, and forming a case or shell, l,as seen at A. Fixed on the shaft, between the two hubs or webs of thepulleys, (or

It is in such a fricwithin the case 1,) is a wheel, m, the periphery ofwhich extends nearly to the flanges k, as seen at B. The periphery ofthe wheel is cut away or recessed at three or any other suitable numberof points so as to form pockets n, in each of which are two rolls, o p,one for each pulley, each pocket being so formed that when the roll isat one end of it it is slightly below the flange k, or so that in therotation ofthe pulleyin the direction of the arrow z the pulley-flangeslides over the rolls. From this large end of the recess the bottom ofeach pocket inclines to the periphery of the wheel, 'as seen at B, or sothat, as the wheel rot-:tes in the direction of the arrow y, the roll ismoved and becomes cramped between the ange and the incline, clutchingthe pulley and wheel together, so that they move as one.

Two pulleys, each with a set of friction-rolls acting in one directionof rotation of the pulley, and inactive in the opposite direction ofrotation thereof, are employed, so that by means of a treadle and a pairof straps a continuous rotative movement may be imparted to the shaft,one strap passing around one pulley in one direction and driving it inonedirection, while the other strap, passing around the other pulley inthe opposite direction, drives it in the oppositedireotion, so that ateach movement up or' down of the treadle-lever the shaft is rotated byone of the pulleys, the rolls of the other pulley during such rotationbeing kept in the ends of their pockets and permitting 'the pulley torotate loosely upon the wheel.

By constructing the pulleys as described, or so as to incase theclutchewheel m and the rolls o p, the friction-pawl mechanism is keptconcealed, and the rolls have the requisite freedom of movement withoutpossibility of displacement.

I claim- The combination, with the shaft a, of the puii leys b c loosethereupon, the clutch-wheel m fast thereupon, and the rolls o p locatedin peripheral recesses ofthe clutch-wheel, the two pulleys having iangesk k, which inclose the clutch-wheel and the rolls, and each pocket orrecess having two rolls, one for each pulley, all substantially as shownand described.

WALTER R. CLOSE.

Witnesses :y

F. A. WILSON, JNO. A. PETERS.

